[html5lib] triple slash comment style

pkg/third_party/html5lib/lib/src/constants.dart

 library constants;
 
 import 'utils.dart';
 
 // TODO(jmesserly): fix up the const lists. For the bigger ones, we need faster
 // lookup than linear search "contains". In the Python code they were
 // frozensets.
 
 final String EOF = null;
 
 class ReparseException implements Exception {
   final String message;
   ReparseException(this.message);
   String toString() => "ReparseException: $message";
 }
 
 // TODO(jmesserly): assuming the programmatic name is not important, it would be
 // good to make these "static const" fields on an ErrorMessage class.
-/**
- * These are error messages emitted by [HtmlParser]. The values use Python style
- * string formatting, as implemented by [formatStr]. That function only supports
- * the subset of format functionality used here.
- */
+/// These are error messages emitted by [HtmlParser]. The values use Python
+/// style string formatting, as implemented by [formatStr]. That function only
+/// supports the subset of format functionality used here.
 const Map<String, String> errorMessages = const {
   "null-character":
      "Null character in input stream, replaced with U+FFFD.",
   "invalid-codepoint":
      "Invalid codepoint in stream.",
   "incorrectly-placed-solidus":
      "Solidus (/) incorrectly placed in tag.",
   "incorrect-cr-newline-entity":
      "Incorrect CR newline entity, replaced with LF.",
   "illegal-windows-1252-entity":
@@ skipping 3081 matching lines @@
   'windows1252': 'cp1252',
   'windows1253': 'cp1253',
   'windows1254': 'cp1254',
   'windows1255': 'cp1255',
   'windows1256': 'cp1256',
   'windows1257': 'cp1257',
   'windows1258': 'cp1258',
   'windows936': 'gbk',
   'x-x-big5': 'big5'
 };